Platen printing press



Aug. 11, 1931.- G. SPIESS I PLATEN PRINTING rimss I Filed June 12, 1929 2 Sheets-Sheet 1 I In y en for:

Aug. 11, 1.931. G. sPIEss 1,313,321

PLATEN PRINTING PRESS Filed June 12'. 1929 2 Sheet S- Shee't 2 Patented Aug. 11 1931 g U -TE time" oFFiCE i GEQIRG sr nss, or LEIPZIG, GEBMANY- r ArEN, rnmrrno rnnss Application filed June "12, 1929, Serial No. 3"70,3 1'1, and in Germany May 16,1928.

I The invention relates to platen printing presses wherein an ink distributing .roller or cylinder is reciprocated together with its I inking rollers, and means are provided for removing theinking rollers-from the cylinder. Certain risks attend the removal ofthe inking rollers from the cylinder while the latter is in operation. Generally the throw-off device for the inking rollers comprises cams actingon spring pressed shanks fixed to slidable bearings :of the ro1lers,1and if these are actuated while the cylinder is in operationan additional load is suddenly thrown on the cylinder, and the 5 spring shanks are subjected to "a sudden bending" stress, which may easily cause damage. 17 W The object of my invention is toprovide improvedmeans for removing this risk, and

2b to' thisend I provide a' d'evice which autog v matically restrains the throw-0E device from'operating while the distributing cyl inder is in operation. preferred constructional'form -of a de- "'-'25 vice according to the invention is illustrated by way of example in the accompanying drawings, in which all details of the platen printing press not necessary for the explanation of the invention are omitted.

In the drawings Fig. 1 is a view 1n elevation of the throw of]? device of the invention and Fig. 1a is a view looking fromthe front toward one of the vertical guides and showing the raised position of the detent.

Fig. 1b is a similar view showing the lowered position of the detent. Fig. 2 is a modification.

The press has two vertical guides 1 with channels 2 for guiding the holder 3 of the cylinder. The inking rollers 5 are mounted on the holder 3 by means of horizontally movable bearings, with springs pulling the '45 rollers towards the circumference of the contact cylinder 7. Distributing rollers 8 act on the circumference of the cylinder, and there may be an additional inking roller 9, to which a doctor 10 supplies ink.

-A bar 11 is horizontally slidable in each.

' against a surface" the inking rollers'according to held by gravity the rollers9 and 8. The rods 14 and 15. work in guides in the side frames.- 7 At the top of the head 12 there is pivoted a pawl17, acted on by a spring 18. sothat normally a projectionuo'f the pawl is pressed 7 19 oli the head 12. The pawl 17 is adapted to engage an abutment 4 of the guides 1 for removing the l I on the holder '3,when the bar. 11 isxnioved towards the holder, the'bar 11 being by this means locked 'inl'the position in which the inking rollers5, the spreading rollers '8 and the inking roller 9 areremoved fromthe cylinder 7 '7 By the downward movement of the holder 3 the abutment 4- is removed from pawl 17 so that the bar 11 is released,

and the shanks 6 acting on the head 12, with v the rods 14, 15 acting. on the cam surfaces 13,Apush the 'bar. 11 back, assisted'by a spring 2 lacting on a lever 25, which rotates on a spindle 31 and is engaged with the Two levers 21 connected by a-hand bar-22 are pivoted on the-spindle 31 and have noses levers 25 the bar 11 as indicated by the arrow. Levers 20 pivotedto the levers 21 rest on the pawl I l7, and"whenthe bar 11 has been moved when: the latter are rocked inlthe opposite direction to that indicated by a curved arrow in the drawing.

there is a slidable detent block 26 normally 7 p and by a springj27 against a stop 28,'but this blo'ck is slightly lifted the h ld r ia' l 'time the' latter ascen 23, adapted; to coact withnoses 32 onvthe for rocking the latter and moving to remove the rollers 5, 8, 9 from thecylinder v. V v v KAt the upper end ofeach guide'channel 2 stop 29 projecting from the lower end of the after disengagement of the pawl 17 and after descent of the distributing cylinder, damage-might occur through the shanks 6 striking the head 12 of the bar, ifit're mained in their path, but this is prevented by providing the head 12 with a cam 16, which in the circumstances mentioned is struck by the abutment 4 when the holder 3 ascends, so that the head is pushed out of the wa of the shanks 16, the stop 29 being then placed inthe path .of'the :pawl 17. 1

In Fig.1. the throw-off device is shown in its inactive position. The inking rollers 5 are in contact with the inking cylinder .7; The roller carriage, by means of guide part 3a, :moving in guide channel .2, lifts up ,de tentv 26, projecting into the same guide channel. Stop .29, therefore, is no longer opposite pawl 17. With the. roller carriage in the aforesaid position the roller-remove ing-deviceis ready for operation. Pawl 17 engages behind. abutment 4 of the roller carriage, locking ithereby theroller-removing-device in its removing position. Upon.

lowering the roller carriage ,athe abutment '4 of thea'oller carriage separates from pawl 17 and the throw-off device rmoves automatically under the action of spring -24"bac'k to normal or inactive position... If, for some reason or another .thereturn movement is interfered. with, then the abutment 4 strikes against the upper part of cam 16, forcing thereby the throw-off device to return .to

upper end position. The arms 37 have wedge shaped ends 38, which engage under the pawl 17 pivoted to the head 12 of the bars 11, when the said pawls have been with inking. rollers, and a throw-01f device for said inking rollers, with a device automatically restraining said throw ofi' device from operation while the distributing roller is in operation.

2. Mechanism according to claim 1, wherein the device restraining the throw-oif device from operation is put out of action by ,a moving part of the press when the holder or carriage of the inking roller reaches itsend position. i

. 3. Mechanism according to claim 1, wherein the ,throwoff device has cam surfacesand the holder of the inking'cylinders has an abutment adapted :to act -on said-.cam surfaces for restoring the thr0w-off device to itsinactive position.

4.v Mechanism according to 1 claim 1, wherein means for manual actuation-ofth'e thIOWwOfiTlBVlCG for the inking :rollers, is disposed at theffront ofthe machine. n

5. Mechanism according to claim 1, hav-T ing-separate hand levers for the actuation and the; retraction-of "the throw -off device respectively.

i In testimony: whereof I ;aflix my signature.

GEORG .SPIESS.

its normal position. The roller carriage is followed in its downward movement -by -de+ tent26, whereupon projection 26arests u on abutment 28. Stop 29, then, is again loc ed 7 opposite of pawl 17. :Detent 26,,consequent- :1y,prevents operation of :the removing device. when the roller carriage is lowered.

According to the modification shown in 3 Fig.2 themanual controlliii means for the throw-off device are placed r aterelly-at the front "of 'the press. Generally it is convenientrto have separate hand levers, for actuation and disengagement 'Iespectively.

Forked arms 25engaging'studs on the throw-01f bars llfor the inking rollers .01! the vertically movable holder or carriage?) of thedistrlbuting cylinder are :fixed to a 7 rock shaft .33 mounted inthe bed frame, and to .therock shaft is fixed a lever 34 extending towards the front OfthQiQI'eSSJ The upper, front part of the frame has two forwardlyiprojecting arms 35, in which is mounted rock shaft 36. To each-end of the latteris fixed an arm 37 adapted to rest on .the holder ,3when the fholder'is in its 

